| 摘要 |
<p>In order to provide a SAW filter having a wide passband matching to the digital TV broadcast waves so as to be low-loss, and obtaining a sharp and large attenuation in the outside of the TV broadcast waves, a constant-K filter is composed of series arm SAW resonators (11,15) and parallel arm SAW resonators (12,16), and a circuit component is formed by connecting an inductor (14,21,22) for shifting a resonant point/antiresonant point to the series arm SAW resonator in series or to the parallel arm SAW resonator in parallel. A plurality of the circuit components are connected in a cascade connection to each other in a plurality of stages via inductors (19) for shifting the resonant point/antiresonant point.
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